First, let's look at the evolution of a fashion trend: skinny jeans
In this example, searches begin to index high in New York and California. As time goes by, the search index increases down the coasts and finally throughout much of the country, which is a normal pattern for fashion trends.
Next, let's look at a brand. Check out this one for Tom's Shoes
Reebok Easy Tone
Finally, let's look at an established brand with a new product launch: Reebok EasyTone
Reebok launched a national ad campaign for its new shoe, 'Easy Tone', in Q4 2009. On the map, you can see the search volume index go from zero to blue in most states in Nov-Dec 2009. By promoting their new product nationally with a multi-media ad campaign, Reebok ignigted interest across the country. And when people are interested in learning more about something, they search.
So, check out the Google Insights for Search tool to see how searches for your products and categories are trending both nationally and regionally to make the most out of your search campaigns.
Posted by Eva Barbier, Google Retail Team